User manual

Page 41
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 3000 C Series
3.5.4 Remote control via the analog interface (AI)
3.5.4.1 General
The optionally available, once installed built-in, galvanically isolated, 15-pole analog interface (short: AI) is located
ontherearsideofthedeviceandoersthefollowingpossibilities:
• Remote control of current, voltage and power
• Remote status monitoring (CC/CP, CV)
• Remote alarm monitoring (OT, OVP, PF)
• Remote monitoring of actual values
• Remoteon/oswitchingoftheDCoutput
Setting all set values via the analog interface must always be done concurrently. It means, that for example the
voltage can’t be given via the AI while current and power remain adjustable by the rotary knobs, or vice versa.
Any device protection thresholds, such as OVP, cannot be set via the AI and therefore must be adapted to the
given situation before the AI takes over control. Analog set values can be supplied by an external voltage source
or generated from the reference voltage on pin 3. As soon as remote control via the analog interface is activated,
the display will show the set values as provided on the analog interface.
The AI can be operated in the common voltage ranges 0...5 V and 0...10 V, both representing 0...100% of the
nominal value. The selection of the voltage range can be done in the device setup. See section „3.4.3. Congura-
tion via MENU“ for details. The reference voltage sent out from pin 3 (VREF) will be adapted accordingly:
0-5 V: Reference voltage = 5 V, 0...5 V set value signal for VSEL, CSEL and PSEL correspond to 0...100% nominal
value, 0...100% actual values correspond to 0...5 V at the actual value outputs CMON and VMON.
0-10 V: Reference voltage = 10 V, 0...10 V set value signal for VSEL, CSEL and PSEL correspond to 0...100%
nominal values, 0...100% actual values correspond to 0...10 V at the actual value outputs CMON and VMON.
Input of excess signals (e.g. >5 V in selected 5 V range or >10 V in the 10 V range) are clipped by the device by
setting the corresponding set value to 100%.
Before you begin, please read these important notes for use of the interface:
After powering the device and during the start phase the AI signals undened statuses on the
output pins such as ERROR or OVP. Those must be ignored until is ready to work.
• Analogremotecontrolofthedevicemustbeactivatedbyswitchingpin“REMOTE”(5)rst.Onlyexceptionis
pin REM-SB, which can be used independently
• Before the hardware is connected that will control the analog interface, it shall be checked that it can’t provide
voltagetothepinshigherthanspecied
• Setvalueinputs,suchasVSEL,CSELorPSEL,mustnotbeleftunconnected(i.e.oating)duringanalogre-
motecontrol.Incaseanyoftheseisnotusedforadjustment,itshouldbetiedtoadenedlevellikegroundor
connectedtopinVREF(solderbridgeordierent),soitgives100%
The analog interface is galvanically isolated from DC output. Therefore we recommend not to
connect any ground of the analog interface to the DC- or DC+ output, if not absolutely neces-
sary.
3.5.4.2 Resolution and sample rate
Theanaloginterfaceisinternallysampledandprocessedbyadigitalmicrocontroller.Thiscausesaspeciceec-
tive resolution, i. e. analog steps. The resolution is the same for set values (VSEL etc.) and actual values (VMON/
CMON) and is 4096 when working with the 10 V range. In the 5 V range this resolution halves. Due to tolerances,
the truly achievable resolution can be slightly lower.